Modern Germany has never been at ease with spies. The ghosts of two totalitarian regimes – Adolf Hitler’s Nazi state and East Germany – still hang over public debate and government deliberations about agents, surveillance and intelligence gathering.The BND – the country’s intelligence agency and one of the biggest in Europe – has sometimes seemed so rule-bound that one former head compared his tenure to running a bureaucracy on the outer reaches of the German state.Politicians and even BND staff have joked that the 6,500-employee agency is “vegetarian” compared with “meat-eating” counterparts such as the UK’s SIS, the US’s CIA...